When was it built?
NO PHOTOS禁止拍照 DANGER危险
PLAY 播放 STOP 停止 PAUSE 暂停
ON开 OFF关 BUSINESS HOURS营业时间
OFFICE HOURS 办公时间 FRAGILE易碎
THIS SIDE UP 此面朝上 ENTRANCE入口处
EXIT出口处 OPEN营业中
（三）日常交际用语
1．电话用语
This is… speaking 我是……
2． 表示“有……”：
Are there any new inventions?
Is there any…?
3．其他
That’s very interesting. 那非常有趣。
Yes, many more. 是的，有许多。
When was the PLA founded? 中国人民解放军什么时候成立的？ （被动语态）
It’s best to…
Thanks to…
What’s next?
The ground must be just right.
The hole should not be too deep.
教学建议
本单元重点例句及相关知识的讲解
1. I saw many old inventions on show.
我看到了许多古老的发明物在展览。
on show意思是“陈列，展览”。on表示“处于某种状态中”。show在此作名词用，与on构成短语，on + 名词还有
on duty（值日），
on sale（出售），
on business（出差），
on leave（休假）等。例如：
There are a number of model cars on show in the museum. And some of the old things are on sale now. She went to Beijing on business last week. Her assistant is on leave now. She could show you around next week.
在博物馆里有许多模型汽车展出，现在有些古老的东西正在出售。上周她到北京出差去了，她的助理也正在休假。她下周可以带你转转。
2. They were all invented hundreds of years ago.
它们都是几百年前发明的。
Hundreds of… 意思是“数以百计的，成百上千的”。hundreds, thousand, million等词与of一起用时，表示不定量的数目，必须用复数形式，而且前面不能有具体的数字。例如：
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